Wrench



(Nb Model.)

B. R 0 S S.

, WRENOH.

No. 296,877. Patented Apr. 15, 1884.

I WITNESSES %MM7 l/wmmfi W 6 Wmmeys UNITED STATES PATENT which.

BAR'NEY ROSS, OF STERLING; OHIO.

WRENCH.

SPECIFICATION forming part of Letters Patent No. 296,877, dated April15, 1884.

Application filed December 26, 1883. (No model.)

wrenches commonly known as monkey or hammer wrenches; and it consists incertain features of construction and in combination of parts hereinafterdescribed, and pointed out in the claims.

In the accompanying drawings, Figure 1 is a view in perspective of myimproved wrench. Fig. 2 is alongitudinal section of the movable jaw andattachments, and of a portion of the shank. Fig. 3 is a longitudinalsection of a rack plate, showing the ribs by which the plate isattached, and before they are bent to secure them to the adjacent bands.Figs. 4 and 5 are views in perspective in detail, the former of a wormand thumb-lever, and the latter of a wedge thatis operated inside of themovable jaw by the worm. Fig. 6 is an elevaflat side of which rests uponthe said shank. Theupperwall of the said chamber is sloping,

to correspond with the incline of the wedge, as shown in Fig. 2. Therear wall of the jaw 13 has a hole, I), and a slot, 12', severing thewall from the hole to the chamber, as shown in Fig. 6. The back part ofthe jaw Bis cut away, so that only two bands, 0 and d, extend around theshank A on the back side. To these bands is attached the rack-piece D,the teeth of which correspond with teeth on the back of the shank A, sothat the two racks fit each other, The inner edges of the bands 0 and(Z- are beveled, as shown, while the ribs on the plate Dnext the ends ofthe plate are perpendicular to the plate, and are of such distance apartas to fit in between the said bands, as shown in Fig. 3. These ribs areswaged or bent over onto the beveled edges of the bands, 5 as shown inFig. 2, holding the parts firmly together. The wedge G at the heel iscut away on top and recessed longitudinally, and provided in the wallsof the recess with a worm-groove, c, that, when the parts are inposition, engages the worm G, that has a shank extending through thehole I), and provided at the rear and on the outside of the jaw with thethumb-lever 9. When this thumb lever is turned to one side, the wedge O,by means of the said worm and groove, is drawn back, leaving the jawloose on the shank A, on which it may be slid along to any desiredpoint. By turning the thumb-lever in the opposite direction the wedge Gis advanced, forcing the front part of the jawaway from the shank A, andbringing the two racks a and D together, thereby securing the j aw inits position on the shank.

In assembling the parts, the worm is insert- 7 5 ed, with thethumb-lever to the rear, into the chamber of the movable jaw, and isturned in 'such position that the narrow portion of the handle of thethumb-lever will pass backward through the slot b, connected with thehole b. The wedge is next placed in position with its worm-grooveengaging the said worm. Next thethumb-lever isturned to the side thatdraws back the wedge, and the jaw Bis slid onto the shank A. The handlea is'next added and secured by the socket-nut a, and the device iscompleted.

In operating the device, theback end of the worm forms a shoulder thatbutts against the rear wall ofthe movable jaw and sustains the forwardthrust of the worm, while the thumb lever, pressing against the outsideof thejaw, holds the worm endwise while withdrawing the wedge.

What I claim isr 1. A wedge operating in a chamber in the movable jaw ofa wrench, and provided with a longitudinal recess and a transversewormgroove, in combination with a worm adapted to engage the groove andactuate the wedge, :00

and provided witha shank extending through 1 piece D, provided with ribsor projections the rear end wall of the movable jaw, and a l swaged orbent so as to engage the said bevthulnb-lever for operating the same,snbstaneled edges and hold the parts firmly in posi- 15 tially as setforth. tion, substantially as set forth.

2. The combination, with the Worm G, pro- In testimony whereof I signthis speeifica- I vided with theshank and thumb-lever, as tion, in thepresenceof twowitnesses, this 11th aforesaid, of thejaw B, provided withthe hole day of December, 1883.

b and the accompanying slot, by means of which the parts may beassembled, substan- BARNEY s Witnesses:

tially as set forth.

3. The bands 0 and d, provided each with ALBERT E. LYNCH, beveled edges,in combination with the rack- I G. H. DORER.

